Inderbitzin K, Engel A, Schilling A, Il'in K, Siegel M. An ultra-fast superconducting Nb nanowire single-photon detector for soft x-rays. Appl Phys Lett. 2012;101.
Abstract: Although superconducting nanowire single-photon detectors (SNSPDs) are well studied regarding the
detection of infrared/optical photons and keV-molecules, no studies on continuous x-ray photon
counting by thick-film detectors have been reported so far. We fabricated a 100 nm thick niobium
x-ray SNSPD (an X-SNSPD) and studied its detection capability of photons with keV-energies in
continuous mode. The detector is capable to detect photons even at reduced bias currents of 0.4%,
which is in sharp contrast to optical thin-film SNSPDs. No dark counts were recorded in extended
measurement periods. Strikingly, the signal amplitude distribution depends significantly on the photon
energy spectrum.VC
|
Julia Toussaint RG Marco Schubert Torsten May Hans-Georg Meyer Benjamin Dietzek Jürgen Popp Matthias Hofherr Matthias Arndt Dagmar Henrich Konstantin Il'in and Michael Siegel. Superconducting single-photon counting system for optical experiments requiring time-resolution in the picosecond range. AIP REVIEW OF SCIENTIFIC INSTRUMENTS. 2012;83.
Abstract: We have developed a cryogenic measurement system for single-photon counting, which can be used
in optical experiments requiring high time resolution in the picosecond range. The system utilizes
niobium nitride superconducting nanowire single-photon detectors which are integrated in a timecorrelated
single-photon counting (TCSPC) setup. In this work, we describe details of the mechanical
design, the electrical setup, and the cryogenic optical components. The performance of the complete
system in TCSPC mode is tentatively benchmarked using 140 fs long laser pulses at a repetition
frequency of 75MHz. Due to the high temporal stability of these pulses, the measured time resolution
of 35 ps (FWHM) is limited by the timing jitter of the measurement system. The result was crosschecked
in a Coherent Anti-stokes Raman Scattering (CARS) setup, where scattered pulses from a
β-barium borate crystal have been detected with the same time resolution.
|
Korneev A, Korneeva Y, Florya I, Voronov B, Goltsman G. NbN nanowire superconducting single-photon detector for mid-infrared. Phys Procedia. 2012;36:72–6.
Abstract: Superconducting single-photon detectors (SSPD) is typically 100 nm-wide supercondiucting strip in a shape of meander made of 4-nm-thick film. To reduce response time and increase voltage response a parallel connection of the strips was proposed. Recently we demonstrated that reduction of the strip width improves the quantum effciency of such a detector at wavelengths longer than 1.5 μm. Being encourage by this progress in quantum effciency we improved the fabrication process and made parallel-wire SSPD with 40-nm-wide strips covering total area of 10 μm x 10 μm. In this paper we present the results of the characterization of such a parallel-wire SSPD at 10.6 μm wavelength and demonstrate linear dependence of the count rate on the light power as it should be in case of single-photon response.
|
Minaeva O, Fraine A, Korneev A, Divochiy A, Goltsman G, Sergienko A. High resolution optical time-domain reflectometry using superconducting single-photon detectors. In: Frontiers in Opt. 2012/Laser Sci. XXVIII. Optical Society of America; 2012. Fw3a.39.
Abstract: We discuss the advantages and limitations of single-photon optical time-domain reflectometry with superconducting single-photon detectors. The higher two-point resolution can be achieved due to superior timing performance of SSPDs in comparison with InGaAs APDs.
|
Steudle GA, Schietinger S, Höckel D, Dorenbos SN, Zadeh IE, Zwiller V, et al. Measuring the quantum nature of light with a single source and a single detector. Phys. Rev. A. 2012;86(5):053814.
Abstract: An elementary experiment in optics consists of a light source and a detector. Yet, if the source generates nonclassical correlations such an experiment is capable of unambiguously demonstrating the quantum nature of light. We realized such an experiment with a defect center in diamond and a superconducting detector. Previous experiments relied on more complex setups, such as the Hanbury Brown and Twiss configuration, where a beam splitter directs light to two photodetectors, creating the false impression that the beam splitter is a fundamentally required element. As an additional benefit, our results provide a simplification of the widely used photon-correlation techniques.
|
